How would you describe a food chain to someone who never thought about that idea before

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?

Which sample at stp has the same number of atoms as 18 liters of ne at stp

What does an electron configuration for an atom relate to the atoms placement on the periodic table